Requested by _miedelas: Y/N and Peter live in a universe where soulmates are meant to be based on the tattoo on your back, and you have to be together, even if you're not in love. Y/N is with another guy, and Peter is with MJ. One day, they have a double date, and MJ and Y/N's boyfriend end up falling for each other and cheating on Peter and Y/N together. The pair of them help each other to get through it and end up falling for each other. Years later when they get married, they're on their way to being intimate when they see that Peter's tattoo has changed to match Y/N's. They find out that MJ's boyfriend's tattoo has also changed to match hers, and so with Tony's help, Y/N and Peter tell the world, and encourage everyone to chase after their true love.

I wandered through to the kitchen of my apartment, my lips parting into a yawn and sleep still pricking my eyes as my feet padded along the floor. I turned into the kitchen, my heart fluttering and a smile curling onto my lips at the sight of my boyfriend's naked back facing me as he looked down at his phone. I bit my lip and let my eyes wander over the back tattoo that painted his skin...and also mine. I wandered forward and rested my hand against the black and grey flowers that sat on his back, alerting him to my presence as he looked over his shoulder.

"Hey, baby, good morning." Leo smiled and chuckled as he turned around to face me.

"Morning. You sleep okay?" I asked, his arms curling around my waist as I rested my hands on his chest.

"I was next to you, of course I slept well." He smirked. I returned it and bit my lip as he leant down, my eyes fluttering shut as he pressed our lips together. Leo and I were together in a world where your life partner was determined by the back tattoo that appeared on everyone on their sixteenth birthday. Every single pair of people in the world had matching tattoos, which in turn was how you found your soulmate. I had met Leo through my best friends, Peter and MJ, who also happened to be each other's soulmates. But this was where the faults of our world came into play. Peter and I had been friends for years, long before we'd turned sixteen, but of course I'd always felt more for the boy. Due to my feelings for him, I'd always secretly hoped that we'd turn sixteen and would be revealed to be soulmates. So when Peter had turned sixteen a month after me, and had a completely different tattoo on his back, I'd been heartbroken. This was made even worse by the fact that when our other best friend, MJ, turned sixteen, she was revealed to be Peter's soulmate instead. The entire situation had absolutely crushed me, but I had had to hide it and act like I was so happy for my best friends, especially when another one of MJ's friends instead turned out to be my soulmate. Leo and I had been together since, and we were happy enough. But part of me thought that I'd never get over Peter truly, and that was what hurt.

"Oh, I need to talk to you about something." Leo mumbled as he broke the kiss and looked down at me.

"I was texting MJ yesterday, and she mentioned the idea of a double date? Me, you, her and Peter." He nodded. My eyes widened slightly, my lips parting as my heart jumped violently at the suggestion. Of course I loved hanging out with MJ and Peter, but I also had the underlying fear that every time that I was with Peter especially, I wouldn't be able to stop my face from betraying me when it came to how I really felt about him.

"Oh-h, did she? That's such a nice idea, what did she suggest?" I asked as I tried to cover up how I felt.

"Dinner at that nice Italian place near them. What should I say, that we can go? She suggested it for tonight." He nodded.

"Sounds fun, I can't wait." I smiled.

"Awesome, baby, I'll text her back now." He returned, making me nod as he let me go and turned back around to grab his phone. My smile slowly dropped as he turned away from me, a quiet sigh leaving my lips at the thought of having dinner with the pair. With Peter. Because in this world, the fact that who you would be with was decided by a tattoo wasn't as complicated as it got, no. No one truly knew where the tradition had come from, or who had come up with the rule, but no one ever diverged from their soulmate. There had been thousands of couples throughout the years who hadn't loved each other, some had even been sworn enemies, but in our reality, that didn't matter for anything. People believed so much in the reliability of our tattoos, they believed so strongly that they told us who we were meant to be with, that everyone HAD to be with their soulmate, whether or not they were in love with them. After all, it was tradition now in our society, and people refused to change, meaning that my situation was far from simple enough for me to just admit to Peter how I felt. My tattoo matched Leo's, Peter's matched MJ's, and so in the eyes of society, the universe had decided. And it had decided that we weren't meant to be together. I sighed and swallowed the tears that always came with this thought process, my eyes flicking once more to the tattoo on Leo's back before I turned and quietly padded out of the kitchen, and away from my supposed soulmate.

Leo and I walked into the restaurant where we were meeting Peter and MJ, my heart already thumping slightly in anxiety of what the next hour would entail.

"I see them, babe, they're just there." Leo mumbled as he pointed to a table in the middle of the restaurant.

"Yeah, I've got them." I nodded as we walked towards them. Peter was the first to spot us, making my eyes waver and my knees go weak as the smile that I was in love with spread onto his kind face. He stood up to greet us, the pair of us still too far away from the table to exchange pleasantries. But that didn't mean that I couldn't admire how amazing he looked. His body was clad in a simple enough white dress shirt and jeans, his signature battered converse making the look a little less formal. But fuck did my best friend and crush look incredible.

"Guys, hey! It's so good to see you!" He exclaimed, MJ also standing up as we got to the table.

"Pete, it's been too long." I smiled as I leant in and hugged him.

"Yeah. It has been." the boy spoke softly into my ear. Those words, paired with his arms gently curling around my waist to return the hug, almost made me melt in his hands. My eyes fluttered shut, the heavenly scent of his cologne filling my nose as we just held each other. I'd never understand how the universe had done this to me. Peter and I were perfect for each other, his arms wrapped around me like they were meant to hold me, and my body fit against his like we were two pieces of a puzzle. Everything about us was perfect...and yet the universe had disagreed. I started to reluctantly pull away from the hug, Peter also seemingly hesitant to let me go as his arms paused before starting to let me out of his grip. I gave him a small smile as we looked at each other again, him returning it as all four of us sat back down.

"So, guys, what's been going on with you? I feel like it's been ages since all four of us caught up." MJ chuckled as Leo put his arm around me. I gulped harshly, my heart jumping in my throat at not only the fact that Peter's eyes seemed to waver at my boyfriend's actions, but also at the fact that he was avoiding anything of the sort with MJ. His elbows rested on the table, his hands tightly clasped together to almost avoid all touch with his girlfriend. I bit my lip and looked at him, his gorgeous chocolate already on me as our gazes locked. I gave him another small smile, him returning it with sad eyes as we continued to gently gaze at each other, and MJ and Leo continued to talk.

~One week later~

"Now it fucking makes sense, now it makes sense why you were so desperate to go to dinner with her so soon." I scoffed, my hands frantically shoving clothes into my bag as Leo stood behind me in our bedroom.

"Y/N, I wanted to go to dinner with her because we're friends! She's your friend too-."

"You're right, Leo, she's my friend, but don't play that bullshit with me and try to act like you two aren't more." I spat as I shot around to look at him with eyes alight with fire. He sighed and looked down, my now-ex boyfriend clearly not having any words left for me as I stared him down. Our double date with Peter and MJ had been a week ago now, and as it had turned out, Peter and I hadn't been the only ones with eyes for each other. We'd just been the only ones not to act on that. This morning, I had discovered hours upon hours of flirty and love-confessing texts between Leo and MJ, those feelings being reciprocated from both sides. I had confronted Leo about it of course, which was when he'd admitted that he and MJ had been talking like this for months, and that they had fallen for each other over this period. Needless to say that I was not sticking around to see how this developed, I was going to get the fuck out of here, and straight to Peter's to also tell him about what had been happening. Because whilst I had never been under the illusion that Leo would be the love of my life, I still had enough respect for myself to not stay with such a cheating asshole.

"I'm sorry, Y/N, this really isn't how this was supposed to go down, but do you know how hard it is?! Do you know how hard it is to not be soulmates with the girl that I'm in love with, in a world where the most taboo thing that you can do is to love someone who isn't your soulmate-."

"Of course I know, Leo, I'm in the same fucking position, I just didn't act on it!" I shouted back. My eyes widened, my heart plummeting to my feet as I realised what I'd just said. I couldn't tell what broke me more, the fact that I'd said it, or the fact that Leo didn't look even slightly surprised at my confession.

"It's Peter, right? He's the one that you're talking about. He's the one who you're in love with. And don't deny it because we're already over, and I'm the one who cheated, so you're in the fucking clear." He scoffed and nodded, his words full of venom as he stared daggers at me. I gulped harshly and tried not to cry, my world feeling like it was crumbling around me as I picked up my suitcase and opened the front door to our apartment. Without another word, I walked out, my keys abandoned on the table as I shut the door, and walked out of Leo's life for good.

I knocked on Peter's front door, my heart almost in my throat out of anxiety at the reason that I was here. After all, Peter was being cheated on too, so he also had a right to know what was going on. After a moment, the door opened to reveal my best friend.

"Y/N, hey! What are you doing here?" He chuckled with a kind smile. I gulped harshly and looked timidly at him.

"Can, um...can I come in? Because we need to talk." I nodded. His smile dipped slightly, his eyebrows furrowed in confusion as he stepped to the side to let me in.

"Sure, of course, what's wrong-." His eyes flicked behind me, his pupils widening as he saw the suitcase that I was in tow with.

"Y/N, fuck, did something happen between you and Leo?" He gulped as I walked in, and he shut the door behind me. I sighed and sat down on the sofa, Peter following suit as he continued to stare at me for any kind of answer.

"Peter, I'm about to tell you something. And it's going to be really hard for you to hear, but I need you to hear it, okay?" I nodded as I looked at him. He gulped and returned the nod, more concern etching onto his face the more that I spoke.

"Yeah, I'm listening." He reassured. I took a deep breath and looked at him, everything in me wanting to just leave now and not break his heart. But he had to know. I couldn't leave without telling him.

"Leo has been cheating on me...with MJ." I admitted after a moment of gaining the courage. Peter's eyes widened, his mouth falling open as his eyes wavered.

"W-what? He's cheating on you? With MJ? So she's cheating on me too?" He choked and shook his head.

"Yeah. She is. I'm so sorry, Pete." I returned the choke, the gravity of the situation only just hitting me as tears also started to prick my eyes.

"I'm sorry too." He shook his head again before pulling me into his arms. I returned the hug, my eyes squeezing shut as both of us sobbed into each other's arms. Because not only had we both been betrayed as much as someone could be, but we had also just lost both of our soulmates. You were meant to stay with your soulmate even if you didn't love them, and whilst I didn't agree with that in the slightest, Leo and MJ falling in love had also left Peter and I in a position where we now had no one who society would deem appropriate for us given that our soulmates were other people. We were now all alone. We were alone.

"How did you find out?" Peter sniffed as I pulled away, but only enough to look at the boy as I stayed wrapped in his arms.

"I saw texts on Leo's phone from MJ. But I'm talking hours of flirting, of sexting even, of conversation that is way beyond that of just friends. He tried to deny it at first, but then he just came clean. He said that they've been talking for months. They're in love, Pete. They're completely in love." I choked and shook my head. He gulped and nodded as he looked down, tears still leaving both of our eyes as we tried to come to terms with everything that we'd just found out.

"I'm so sorry that you had to find out like this, Pete. I know that it should have come from MJ, but you're my best friend, and so I couldn't in good conscience not tell you." I mumbled, our hands subconsciously ending up joined as we mourned the deaths of our relationships together.

"No, it's okay, you were right to tell me. It's just so fucked up, but I guess that neither of them truly loved us if they were willing to hurt us like this." He returned.

"That's what gets me. Not only are they screwed, but we are too. The two people who we need to be with if we don't want to be frowned upon have rejected us, they've said no. What are we supposed to do? How do we fix this?" I choked and shook my head.

"Well...I guess that we find someone else." Peter replied. My eyes widened and my head shot up to look at him, my mind hardly believing what he was suggesting as he returned the look.

"Peter, w-what?" I scoffed. He bit his lip, his gorgeous chocolate eyes flicking over my face as if they were admiring me. Every few seconds, they'd flick to look at my lips, making my heart violently jump in my chest before he finally settled on looking back into my eyes.

"Can I ask you something, angel?" He asked softly, the pads of his thumbs soothingly massaging the backs of my hands as they stayed in his grip. I gulped and forced myself to nod, my heart beating so harshly that I almost felt sick in anticipation of what he'd ask. But also the introduction of the loving nickname. That was new. And I had to admit, it was getting me excited for Peter's question. He gave me a small smile before parting his lips and starting to speak, making my eyes widen at the words that came out. The words that would in time...change everything.